Underjet-fired coke oven



I AprilV 11;, 1939. G. '.J. JACKSON' v` UNDBRJETFIR-ED ACOKE OVEN .Filed Marchy 1o, 1937 2 shets-sheet 2 Alva/mmv# Patented Apr. l1, 1939 PATENT oFFlcE UNDERJET-FIRED COKE OVEN George James Jackson, London, England, assignor to Woodaii-Duckham (1920) Limited, London, England, a British company Application March 10, 1937, Serial No. 130,167 In Great Britain April 27, 1936 s claims. (ci. 13s-44) curately varying the quantity of fuel gassupplied to any branch pipe.

The variation and adjustment of the amount of gas supplied by a branch pipe cannot properly 15 be controlled by an adjustable valve, and one method frequently adopted is to provide a joint in the branch pipe, between the two parts of which joint is inserted a plate containing a calibrated aperture. The supply of fuel ,gas through each individual branch pipe can then be varied by inserting a plate having an aperture of the appropriate size. satisfactory in practice, and it is the object of the present invention to provide a more convenlent method of adjusting the quantity of gas supplied through a branch pipe. An arrangement has also been proposed in which the area of a iixedcircular nozzle in a horizontal branch pipe is varied by inserting rods having different and chosen diameters. A crescent-shaped aperture is thus produced between the nozzle and the rod, which has the disadvantage that deposits from the fuel gas are liable to form, in the spaces where the gap is small, thus producing partial blockage of the aperture, and a. change in the calibration thereof. In order to minimise the risk of obstruction of the calibrated aperture, its form should always be circular.

According to the present invention,` I pro- 40 vide an arrangement for controllingthe fuel gas supplied to the heating ilues of underjet-ilred coke-ovens, in which the fuel gas is conveyed to the heating ues through branch pipes` con- .nected dlrec'tly'to a fuel gas main and mean's are provided permitting the insertion of an interchangeable nozzle plug containing acalibrated aperture, in the path of the gas through the branch pipe, without breaking the connection between the branch pipe and the fuel gas main, the nozzle plug, when inserted, being held positively in position.

Preferably, the nozzle plug is formed as a double-ended unit comprising two calibrated nozzle-elements (each containing a central, cir- 525` cular calibrated aperture)v joined by spacing 'I'his method is not entirely,

members, iivhichs'pacing members are arranged' so as not to obstruct the 'gas-flow through the nozzle-element which is in use.

The manner of carrying the present invention into practical effect is more particularly described 5 with reference to the accompanying drawings, in which:

Figure 1 shows the disposition of the fuel gas mains in relation'to the branch pipes supplying fuel gas to the burners in the heating iiues of a 10 coke-oven; i

Figure 2 is a part-sectional elevation showing the position of the nozzle plug;

Figure 3 is a sectional elevation on the line A-A of Figure 2; and l5 Figure 4 is a modified arrangement, corresponding to Figure 2, in which the nozzle plug is arranged vertically instead of horizontally.

Referring to Figure l, the gas mains I are arranged in a passagebeneath a coke-oven, and to 20 each main I are connected a plurality of branch pipes 2 through which fuel gas is supplied to the burners in the individual heating ilues. 'I'he Calibrating device which forms the subject of the( present invention controls the amount of fuel 25 gas supplied to the burner, and is preferably positioned in the cross fitting 3, but alternatively may be positioned in the cross fitting l.

Referring to Figures 2 and 3, the branch pipe 2 is connected to the fuel gas main I through the 30 cross pipe fitting 3, which latter has four branches at right angles, to two adjacent branches of which are connected the fuel gas main I and the branch pipe 2. The calibrated nozzle plug comprises two nozzle elements 5a and 5b containing central, 35 circular, calibrated apertures, the two elements 6a and 5b being joined by distance pieces Ii, as shown in Figure 3. The seating 'I for the nozzle plug is preferably conical. the cooperating surface on the nozzle plug also having a conical form. 40

Thenozzle plug is inserted and removed through the branch of the cross pipe tting 3 opposite to the branch pipe connection, and seats in the connection to the branch pipe 2. The nozzle plug is maintained in position on its seat- 45 ing by means vof the screwed stopper 8 and the spring washer l bearing against the end of the nozzle plug which is not in use.

. In order to prevent the nozzle plug turning when the stopper 8 is screwed in, whereby the 50 distance pieces 6 might obstruct the opening to the fuel gas main I, a. stop 9 is provided on the plug I0 which closes the fourth branch of the cross pipe fitting 3. As shown in Figure 3, the stop 9 projects a short way into the space between 55 the two distance pieces 6, and so prevents the nozzle lplug from turning.

In the modification shown in Figure 4, the nozzle plug is arranged vertically, and seats on the connection of the cross pipe fitting .t to the fuel gas main l, and is inserted and removed through y the opposite branch of the cross pipe tting. -In

other respects, the arrangement is similar to that of Figure 2.

Instead of a double-ended unit, the nozzle plug may consist of a single nozzle-element such as 5a or 5b, with a suitable distance piece attached thereto.

The arrangement of the present invention has the advantage that a nozzle plug can be changed quickly and conveniently, either by reversing the nozzle plug or by changing it for another, without breaking the branch pipe connections. Moreover, the present invention has the advantage that the circular form of the calibrated aperture is preserved, thereby avoiding the risk of partial obstruction by deposits from the fuel gas, while the fuel gas is uniformly distributed in the branch pipe.

What I claim is:

l.. For controlling the supply of fuel gas to the heating nues of underjet-red coke-ovens, a double-ended nozzle plug unit, comprising two nozzie-elements, each containing a calibrated aperture, spaced Aapart by distance pieces, and adapted to be inserted in a cross pipe tting between a fuel gas main and a branch pipe convey'ing fuel gas to said heating ilues.

2. Arrangement for adjusting the supply of fuel gas to the heating ues of underjet-fired coke-ovens, comprising a fuel gas main, a branch pipe conveying fuel gas to a heating ue, a pipe arcaico 4serted in each ofthe said remaining branches of the connecting member to close the same and to hold said nozzle-element positively in position without obstructing the flow of the fuel gas.

3. Arrangement for adjusting the supply oi fuel gas to the heating flues of underiet-hrerl coke-ovens, comprising a fuel-gas main, a branch pipe conveying fuel gas to a heating ue, a cross pipe tting having four branches at right angles, to two adjacent .branches of which cross pipe tting are connected said fuel gas main and said branch pipe, an interchangeable nozzle plug comprising two nozzle-elements each containing a calibrated aperture and spaced apart by distance pieces, inserted into saidv cross pipe tting through one of the remaining branches thereof and so placed in said cross fitting that the fuel gas flows through one of said calibrated apertures and between the said distance pieces,

means inserted in the latter branch of said cross.

pipe fitting to close the saine and `to hold the nozzle plug positively in position therein, and means insertedin the fourth branch of said cross pipe tting to close the same and to hold said distance pieces out of the path of the fuel gas.

GEORGE JAMES JACKSON. 

